Process of making film-supports for color photography



Jan. 9, 1934. .1. EGGERT ET AL 1,943,159

PROCESS OF MAKING FILM SUPPORTS FOR COLOR PHOTOGRAPHY Filed Oct. 22, 1929 Patented Jan. 9, 1934 PATENT FFICE I PROCESS MAKING FILM-SUPPORTS FOR COLOR PHOTOGRAPHY John Eggert, Leipzig, and Gerd Heymer, Dessau, Germany, assignors to Agfa Ansco Corporation, Binghamton, N. Y., a corporation of New York Application October 22,

1929, Serial No. 401,623,

and in Germany October 23, 1928 13 Claims.

The present invention relates to a process of making film supports having linear semi-cylindrical light refracting elements. More particularly it relates to a method of forming these elements after a model in form of a roller which is wound closely and uniformly with a thin wireshaped body.

We have found that linear gratings of semicylindri al light refracting elements may be produced on films without the aid of engraved rollers by employing as model a roller of metal, glass or other suitable material and preferably polished, which is wound closely and uniformly with thin wire. A suitable wire should be -60 a in diameter and the winding should have about 16-25 turns per millimeter, so as to produce the required cylindrical lines on the film. Instead of a wire, any other material having a suitable cross section I may be used.

The roller thus wound with wire may be used in various ways for producing a lined grating on the film.

If the film is to be provided with the lined grating in the course of its manufacture, the roller, wound with wire as explained, or a duplicate f it, made by casting or by a galvano-plastic method or in any other manner, is rolled upon the casting surface of the known machine for casting the film, so as to produce on this surface an imprint of the wire winding. When the casting surface is of metal, the material constituting the wire winding or the duplicate aforesaid must be harder than the material of the casting surface. For a casting surface, nickel may be used and for the winding steel wire. On the other hand, the casting surface may be a layer of suitable colloid material, for instance a cellulose derivative, in which case the wire winding may be of material softer than steel. In this case the colloid layer must be made plastic by heating it or by treating it with a suitable liquid before the rol ing operation. The casting surface thus provided with an impression of the wire winding now receives the celluloid dope or the like which is to be cast in the form of a band. The film thus produced has on its surface the required relief.

A casting surface prepared according to our invention, is illustrated in the accompanying drawing, in which Fig. 1 is a top plan view of the film casting support and Fig. 2 is a sectional view through the casting support. It is obviously impossible to show the details on the casting surface in any way near the proper scale. Therefore, the impressions of the wires on the casting surface are magnified many hundreds of times in scale, in order to more clearly point out the invention.

As seen from Figs. 1 and 2, the casting support 1 bears on its surface 2 an immense number of linear impressions 3 of semi-cylindrical form. According to the diameter of the wires used for impressing the negatives of the wire windings, the individual semi-cylindrical lined elements have a diameter of l0 to ,u, and 2516 of them are accumulated per millimeter.

When the lined grating is to be produced on the cast film either before or after the latter has been coated with emulsion, the wire roller must first be used to make a second roller with a negative profile. This can be done, for instance, by rolling the first roller on a second roller which is of a material softer than the wire winding, or a negative of the wire roller may be produced electrolytically. In the latter case the wire may be wound on a roller of easily destroyable material, such as glass, and then electrolytically coppered in order to unite the turns of the wire firmly together; the glass roller can then be smashed and the pieces removed, whereby there is produced a hollow cylinder having the wire winding on its inner surface. This cylinder serves as a mould for producing a roller having a negative profile; for instance, the cylinder may be filled with metal or a strong metal layer may be produced on the inner surface by electrolysis. From the negative roller thus produced it is obvious that copies may be made and used for engraving.

A rollerhaving a negative profile may also be made by pressing the wire wound roller against another, smooth roller, so that on the periphery of the wire-bearing roller, there is produced an impression of the wire winding, and then removing the wire. In this case it is obvious that the material of the wire must be harder than that of the roller on which it is wound. Finally, a counterpart of the Wire winding of the roller may be produced by filling the space between the wire and the roller with a suitable material which unites firmly with the surface of the roller.

The roller obtained in any of the manners described may be used to impress the finished film after the latter has been heated or treated with a suitable liquid to make it sufficiently plastic.

We claim:

1. A method of making a support for casting lenticular films which comprises impressing the surface of the casting support by means of a roller provided with a relief formed by elements having a cylindrical curvature, thus producing parallel grooves forming a lined grating.

2. A method of making a support for casting lenticular films which comprises impressing the surface of the casting support by means of a roller provided with a coil of wire, thus producing parallel grooves forming a lined grating.

3. A method of making a support for casting lenticular films which comprises impressing the surface of the casting support by means of a roller provided with a coil of wire of a diameter of to thus producing parallel grooves forming a lined grating.

4. A method of making a support for casting lenticular films which comprises impressing the surface of the casting support consisting of nickel by means of a roller provided with a coil of steelwire of a diameter of 40 to 60 IL, thus producing parallel grooves forming a lined grating.

5. A method of making a support for casting lenticular films which comprises impressing the surface of the casting support consisting of a colloid layer superficially made plastic by means of a roller provided with a coil of steel-wire of a diameter to 40 to 60 lb, thus producing parallel grooves forming a lined grating.

6. A method of making a support for casting lenticular films which comprises impressing the surface of the casting support consisting of a colloid layer superficially made plastic by heating, by means of a roller provided with a coil of steel-wire of a diameter of 40 to 60 ,lL, thus producing parallel grooves forming a lined grating.

7. A method of making a support for casting lenticular films which comprises impressing the surface of the casting support consisting of a colloid layer superficially made plastic by a suitable liquid, by means of a roller provided with a coil of steel-wire of a diameter of 40 to 60 11., thus producing parallel grooves forming a lined grating.

8. A method of making a support for casting lenticular films which comprises impressing the surface of the casting support consisting of a cellulose derivative superficially made plastic by a suitable liquid by means of a roller provided with a coil of steel-wire of a diameter of 40 to 60 i, thus producing parallel grooves forming a lined grating.

9. A support for casting lenticular films having a surface provided with parallel grooves of cylindrical curvature forming a lined grating.

10. A support for casting lenticular films having a surface provided with parallel grooves of cylindrical curvature, the corresponding cylinder having a diameter of 40 to 60 [.L, said grooves forming a lined grating.

11. A support for casting lenticular films comprising a colloid layer having a surface provided with parallel grooves of cylindrical curvature said grooves forming a lined grating.

12. A support for casting lenticular films comprising a cellulose derivative layer having a surface provided with parallel grooves of cylindrical curvature said grooves forming a lined grating.

13. A method of making a support for casting 105 lenticular films which comprises producing on the surface of the casting support parallel grooves having a cylindrical curvature and forming a lined grating.

JOHN EGGERT. GERD HEYMER. 

